Proton spin relaxation study of polar liquid crystals with induced smectic phases

V. Satheesh; D. Loganathan; K. Venu; V. S. S. Sastry; Roman S. Dabrowski; Marzena Brodzik

doi:10.1117/12.299980

1 February 1998 Proton spin relaxation study of polar liquid crystals with induced smectic phases

V. Satheesh, D. Loganathan, K. Venu, V. S. S. Sastry, Roman S. Dabrowski, Marzena Brodzik

Proceedings Volume 3318, Liquid Crystals: Physics, Technology, and Applications; (1998) https://doi.org/10.1117/12.299980
Event: Liquid Crystals, 1997, Zakopane, Poland

Abstract

Detailed frequency dispersion study of proton spin-lattice relaxation times (T₁) with Larmor frequency over a wide range using FCNMR technique has been carried out on the binary mixture of 4-Cyanophenyl-4'-octylbenzoate and 4- Cyanobiphenyl-4' (7BCB), exhibiting induced smectic island. The data were analyzed using a composite molecular dynamic model incorporating the different known mechanisms for the spin relaxation. The T₁ dispersion in 8CN is essentially dominated by the order director fluctuations (ODF) in the nematic phase, while in 7BCBC they are governed exclusively by the self-diffusion of the molecules. The intermediate nematic phases show a gradual change between the two different scenarios. The formation of smectic phases are accomplished by the near freezing out of the ODF contribution, and sudden slowing down of the diffusion. There orientations show a variation in their correlation times in the nematic phases over these relative concentrations, but show dramatic decrease in correlation times on the formation of layered structures.

Citation Download Citation

V. Satheesh, D. Loganathan, K. Venu, V. S. S. Sastry, Roman S. Dabrowski, and Marzena Brodzik "Proton spin relaxation study of polar liquid crystals with induced smectic phases", Proc. SPIE 3318, Liquid Crystals: Physics, Technology, and Applications, (1 February 1998); https://doi.org/10.1117/12.299980

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